Hidden Lake Trail is a one trailhead great outdoors trail, so you're looking at an in and out trek. This great outdoors trail has a total elevation difference of 3,014 feet, and that is higher than average. At parts of the year this region sees very little rain, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. The time needed for this backcountry walk is roughly 7 hours, but of course some people walk a bit slower and some a bit faster. Keep in mind that this is a long hiking and backpacking trail, so make sure you bring plenty of supplies. Hidden Lake Trail goes through some very different elevations, so keep in mind that you may need to dress differently at different elevations. Being 8.2 miles long it's a mid length hike.